Cita APA

Smith, R. L., & Smith, R. L. (1980). Ecology and field biology (3.edition.). New York, New York: Harper & Row.

Citación estilo Chicago

Smith, Robert Leo, y Robert Leo Smith. Ecology and Field Biology. 3.edition. New York, New York: Harper & Row, 1980.

Cita MLA

Smith, Robert Leo, y Robert Leo Smith. Ecology and Field Biology. 3.edition. New York, New York: Harper & Row, 1980.